Hey, > I’m using a Sierra EM9191(sdx55) with PCIe on a raspberry CM4. > Until now I had a firmware based on openWRT21.02, for which Aleksander had > tuned the MM1.18.2 and few drivers. > It worked nicely but we bought a new lot of CM4 and I need to upgrade few > files for it to boot (start4.elf and fixup.dat). > Upgrading the gpu-firmware package of the bcm2711 did the trick but it seems > to have a side effect because the modem can’t connect properly anymore. > For every new attempt (through luci) it attach, register and fail to connect, > leaving the modem in a disabled state. > > My first move was to try the ‘official’ new openwrt, with latest update and > better support to my hardware. > I had the same result with openwrt 23.05/MM1.20.6 and openwrt master/MM1.22 > > If I delete my interface in luci, then recreate it, sometimes it connects but > there is no downlink traffic. > > When I try manually to establish the connection, I have this return: > # mmcli -m 0 -e > successfully enabled the modem. > # mmcli -m 0 --simple-connect="apn=" > error: couldn't connect the modem: > 'GDBus.Error:org.freedesktop.ModemManager1.Error.Core.Unsupported: Cannot > disable multiplex support' > > I managed to make the MHI driver handle the modem but I’m struggling with MM, > anyone has a clue of what’s going on? > If you need more information or trace, just let me know. >
Could you try adding "multiplex=requested" to your --simple-connect call? That "cannot disable multiplex support" error happens when we detect there is a data aggregation protocol configured in the port. Could you post a full MM debug log to try to understand where that comes from? -- Aleksander
